LABIATE. 283 



cordate-ovate or ovate-lanceolate, serrate-crenate, rugose, hispid, the lower 

 smooth ; whorls 6 — lO-flowered, distinct ; teeth of the calyx lanceolate, 

 acute and somewhat spiny. S. sylvatica Nutt. 



Moist woods. Can. to Car. W. to Oregon. July, Aug. %. — Siem 2 — 3 

 feet-high, branched, mostly hispid on the angles. Flowers purplish ; the whorls 

 forming a long terminal spike. Marsh Hedge Nettle. 



25. MARRUBIUM. Z.mw.— Horehound. 



(Of doubtful origin, some say from a town so called in Italy.) 



Calyx tubular, 5 — 10-nerved, with 5 — 10 spreading teeth ; 



the throat hairy. Corolla 2-lipped ; upper hp flattish or concave ; 



lower 3-lobed, the middle lobe broader and usually emarginate. 



Stamens 4, included ; the lower pair longer. 



M. vulgare Linn. : stem erect, white and woolly ; leaves roundish-ovate, 

 toothed, rugose, very woolly beneath ; whorls villous, many-flowered ; calyx 

 with 10 setaceous hooked teeth. 



Road sides. Can. to Car. W. to Miss. July, Aug. %.. — Stem 12 — 18 

 inches high, branched from the base, covered with a white wool. Flowers 

 small, white, in crowded whorls. Smell aromatic ; flavor bitter. Medicinal. 

 Introduced from Europe. White Horehound. 



26. BALLOTA. Li7in.— Fetid Horehound. 

 (From the Greek /?aXXw, to reject ; on account of its disagreeable smell.) 



Calyx funnel-form, 10-nerved, with 5 — 10 broad mucronate 

 teeth. Corolla 2-lipped ; upper lip erect, somewhat concave, 

 emarginate ; lower trifid, the middle lobe largest and emarginate. 

 Stamens 4, ascending ; the lower pair longer. 



B. nigra Linn. : hairy or smoothish ; leaves ovate, truncate at base, 

 green on both sides, more or less hairy ; teeth of the calyx 5, dilated at the 

 base, subulate-mucronate at the summit. 



At Hull, Mass. Big. July. %.—Stem 2—3 feet high. Flowers purple, 

 rarely white, in whorls. Whole plant fetid. Introduced from Eurupe. 



Black Horehound. 



VIII. Ajugoide^. Corolla with the upper lip very short, sometimes 

 bijid, with the segments mostly depending. Stamens 2 or 4, ascending, 

 exserted. Achenia more or less reticulate-rugose. 



27. TRICHOSTEMA. Z,mw.— Trichostema. 



(From the Greek Qpi^, ^P^X^^t ^ ''^"■' ^^'^ errnfta, a stamen; in allusion to its 

 hair-like stamens.) 



Calyx campanulate, oblique, resupinate, unequally 5 -cleft; 

 the three upper teeth (apparently lower) elongated ; the two 

 others short. Corolla with the tube slender ; upper lip falcate. 

 Stamens 4, very long and curved. 



